Help Maintain Blood Pressure Already Within the Healthy RangeNOW Blood Pressure Health combines two botanicals widely known to support healthy cardiovascular function. MegaNatural-BP is a patented and clinically tested Grape Seed Extract standardized for Polyphenols. MegaNatural-BP has flavonoids that can support healthy arterial function and may help maintain blood pressure already within the healthy range. In addition, NOW has included a standardized Hawthorn Extract for free radical protection and cardiovascular support.